Monthly Climate Summary for December 2009 at Whipsnade (Lodge)
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    Very unsettled but mild first week;  very cold and wintry second half although cold relaxed after Christmas back forward
                         
Overall mean temperature was 2.2 ēC which is -1.6 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 4.3 ēC which is -1.9 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 0.2 ēC which is -1.3 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 4.6 ēC                
Mean 24hr minimum (09-09) was -0.3 ēC                
  Highest day max was 9.8 ēC on  the   5            
  Lowest day max was -0.5 ēC on  the 18            
  Highest night min was 7.4 ēC on  the 6            
  Lowest night min was -8.9 ēC on  the 20            
  Lowest grass min was -15.4 ēC on  the 21            
                         
Total rainfall this month was 113.7 mm which is 160.1 per  cent of the 1971-2000 average    
  Highest daily fall was 17.6 mm on  the 29            
Number of hours with rain was                    
               TSR rainfall duration was 114.0 hrs which is   per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 15.0 hrs on  the              
  Mean rainfall intensity 1.00 mm/hr                
                         
Total CS sunshine this month was 55.5 hrs which is 114.4 per  cent of the 1971-2000 average    
Equiv. C/S sunshine total was   hrs which is   per  cent of the 1971-2000 average    
  Highest daily sun was 6.3 hrs on  the 20            
                         
Maximum  snow depth  was 24.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1006.8 mbar which is -7.8 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1033.6 mbar on  the 11            
  Lowest  pressure at 09Z 985.9 mbar on  the 22            
                         
Number of days with:                      
Air Frost 15   0.2mm rain 20   No  sun 10   Snow lying 12    
Grnd Frost 20   1.0mm 15   3h  sun 9   Snow/sleet 14    
Max < 0ēC 4   5mm 7   6h  sun 2   Hail 1    
Max > 10 1   10mm 4   9h  sun 0   Thunder 0    
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 10    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: